JP5885106B2 - Anchor member fixing method for existing concrete structure - Google Patents

Description

  In the present invention, when exchanging an existing support interposed between a superstructure and a substructure of a bridge structure with a new support, etc., an existing concrete structure such as a superstructure is added to a stud gibber, an anchor bolt, etc. It is related with the anchor member fixing method of the existing concrete structure which integrates these anchor members.

  In recent years, for concrete structures such as bridges, the existing bearings interposed between the superstructure and substructure of the bridge have been replaced with new ones suitable for the conditions due to deterioration over time and changes in application standards. Increasing cases of replacement.

  When such an existing support is replaced with a new support, the existing saddle or sole plate may be replaced with a sole plate suitable for the new support.

  However, the sole plate is generally structured to be joined to the upper work by embedding and integrating an anchor member such as a stud diver or anchor bolt that protrudes from the joint surface into the upper work, and a new sole plate is already installed. In order to join to the upper work, it is necessary to integrate an anchor member such as a stud gibber protruding from the joining end face part of the new sole plate with the existing super work.

  Conventionally, in a method of newly integrating an anchor member such as a stud gibber to an existing concrete structure such as the above-described superstructure, an anchor insertion hole is formed by rolling a predetermined portion of the existing concrete structure, Insert an anchor member such as a stud diver that protrudes from the joint end face of the new sole plate into the anchor insertion hole, and in that state, fill the anchor insertion hole with a highly fluid filler such as mortar and cure it. There is known a method of integrating an anchor member with an existing concrete structure such as a superstructure (see, for example, Patent Document 1).

  On the other hand, when filling a highly anchorable filler such as mortar from the lower side into the sealed anchor insertion hole, the filler such as mortar injected into the anchor insertion hole flows down through the hole and sequentially from the lower side. Since it is filled, the air above the filler is compressed accordingly, and the pressure in the anchor insertion hole rises, and the injection of the filler may be hindered by the pressure.

  Therefore, when performing the filling operation, the exhaust tube is inserted into the anchor insertion hole together with the anchor member, and the air in the hole is exhausted through the exhaust tube in parallel with the injection of mortar, etc. The rise is suppressed (for example, refer to Patent Document 2).

JP 2009-287183 A JP 2010-185247 A

  However, in the conventional technology as described above, since the anchor insertion hole is formed by rolling concrete, it is difficult to manage the depth of the anchor insertion hole. The tip of the tube may not reach the inner upper end of the insertion hole.Therefore, the air accumulated at the upper end may not be properly discharged and may cause bubbles in the filler such as mortar. there were.

  In addition, in the exchange work of the bearing as described above, it may not be possible to secure a space for humans to enter between the upper work and the lower work, in which case the actual depth of the anchor insertion hole, etc. There was also a problem that it could not be visually recognized.

  Therefore, in view of such a conventional problem, the present invention can stably fill the anchor insertion hole with a filler such as mortar while suitably discharging the air in the anchor insertion hole, and reliably attach the anchor member to the existing concrete body. The object is to provide an anchor member fixing method for an existing concrete structure that can be fixed.

  The feature of the invention according to claim 1 for solving the conventional problems as described above and achieving an intended object is that an anchor insertion hole is formed in an existing concrete structure, and then an anchor member is formed in the anchor insertion hole. In the anchor member fixing method for an existing concrete structure, in which the anchor member is integrated with the existing concrete structure, the distal end portion of the fixed outer pipe is attached to the anchor insertion hole. The anchor member is inserted into the anchor insertion hole in a fixed state, and the exhaust inner pipe is movably inserted into the fixed outer pipe, and the distal end opening of the exhaust inner pipe has the anchor insertion hole. It is fed out until it hits the inner upper end of the inner wall, and after that, the air in the anchor insertion hole is discharged through the inner pipe for exhaust, and the filler is inserted into the anchor insertion hole. It is to fill.

  According to a second aspect of the present invention, in addition to the configuration of the first aspect, the proximal end side of the exhaust inner pipe is connected to suction means, and negative pressure is generated in the anchor insertion hole by the suction means. It is in.

  According to a third aspect of the present invention, in addition to the configuration of the first or second aspect, the string-like detection means for detecting the state of an object positioned ahead of the distal end portion of the fixed outer tube Inserting the exhaust inner pipe into the fixed outer pipe instead of the detecting means after detecting the state of the inner upper end in the anchor insertion hole using the detecting means. is there.

  According to a fourth aspect of the present invention, in addition to the configuration of the third aspect, the detection means is a fiberscope.

  In the anchor method for anchoring an existing concrete structure according to the present invention, as described above, after an anchor insertion hole is formed in the existing concrete structure, the anchor member is inserted into the anchor insertion hole, and the anchor insertion is performed in that state. In the anchor member fixing method for an existing concrete structure in which a filler is filled in the hole and the anchor member is integrated with the existing concrete structure, the anchor member is fixed in a state in which a distal end portion of a fixed outer pipe is fixed. Inserting into the anchor insertion hole and movably inserting the exhaust inner pipe through the fixed outer pipe, and extending the exhaust inner pipe until its tip opening hits the inner upper end of the anchor insertion hole. After that, the anchor insertion hole is filled with a filler while exhausting the air in the anchor insertion hole through the exhaust pipe. Thus, the tip of the exhaust inner pipe can be reliably positioned at the inner upper end of the anchor insertion hole, the air in the anchor insertion hole can be suitably discharged, the generation of bubbles is prevented, and A filler such as mortar can be efficiently filled into the anchor insertion hole.

  Further, in the present invention, the base end side of the exhaust inner pipe is connected to a suction means, and a negative pressure is generated in the anchor insertion hole by the suction means, thereby facilitating injection of the filler into the anchor insertion hole. Can be done.

  Further, in the present invention, a string-like detection means for detecting the state of an object positioned ahead of the distal end portion of the fixed outer tube is inserted into the fixed outer tube, and the anchor is used by using the detection device. After detecting the state of the inner upper end in the insertion hole, the exhaust inner pipe is inserted into the fixed outer pipe in place of the detection means, thereby securing a space for a person to enter the opening of the anchor insertion hole. Even when the state in the anchor insertion hole cannot be visually recognized, the state such as the depth of the anchor insertion hole can be detected, and the filling operation can be reliably performed based on the detection information.

  In the present invention, since the detection means is a fiberscope, it is possible to detect the state of the object that is preferably located beyond the tip.

It is a partial expanded longitudinal cross-sectional view which shows an example of the anchor member part of the newly installed member used for this invention method. (A) is a longitudinal cross-sectional view which shows an example of an existing concrete structure, (b) is a longitudinal cross-sectional view which shows the state of the anchor insertion hole formation process of this invention method. (C) is a longitudinal cross-sectional view which shows the state of an anchor member insertion process same as the above, (d) is a longitudinal cross-sectional view which shows the state of the inspection process. (E) is a longitudinal cross-sectional view which shows the state of the exhaust pipe insertion process same as the above, (f) is a longitudinal cross-sectional view which shows the state of the filler injection | pouring process. (G) is a longitudinal cross-sectional view which shows the state which injection | pouring of the filler same as the above was completed, (h) is a longitudinal cross-sectional view which shows the state which joining of the said new installation member was completed.

  Next, an embodiment of the anchor member fixing method for an existing concrete structure according to the present invention will be described based on the embodiment shown in FIGS. In the figure, reference numeral 1 denotes an existing concrete structure such as a bridge superstructure, and reference numeral 2 denotes a new member to be newly joined to the existing concrete structure 1.

  The new member 2 is, for example, a flat plate-like sole plate that is joined to the lower part of the upper part of the bridge, and is interposed between the upper part of the bridge and the lower part of the bridge due to deterioration over time or changes in application standards. As the existing bearing is replaced with a new one suitable for the conditions, the existing sole plate or the ridge is replaced with the existing concrete structure 1.

  The sole plate 2 is formed of a flat steel plate, and the upper surface thereof, that is, the joint end surface 2a portion with the existing concrete structure 1, has a plurality of anchor members 3, 3 ... vertically upward from the joint end surface 2a. Are anchored to the existing concrete structure 1, that is, the anchor insertion holes formed in the existing concrete structure 1 are anchored. In this state, the anchor insertion hole is filled with a filler such as mortar, and the anchor members 3 and 3 are integrated with the existing concrete structure 1 to be joined to the existing concrete structure 1. Yes.

  In the figure, reference numeral 4 is a mold member fixed to the outer peripheral portion of the sole plate 2, and reference numeral 5 is a rubber material that seals a gap between the mold member 4 and the existing concrete structure 1. It is a sealing material having elasticity composed of the like.

  As the anchor members 3, 3 ..., for example, stud studs as shown in FIG. 1 are used, and one or more of the anchor members 3, 3 ... are provided with the distal end portion of the fixed outer tube 6 respectively. It is fixed along the anchor members 3, 3 .... The anchor members 3, 3... Are not limited to stud gibbles, and may be anchor bolts, deformed reinforcing bars, or the like.

  Further, the base end side portion of the fixed outer tube 6 is led out to the side portion of the sole plate 2 through the sealing material 5 fixed on the mold member 4.

  The fixed outer tube 6 is formed in a long and flexible tube with a synthetic resin material or the like, and the exhaust inner tube 7 and the detection means 8 are inserted into the fixed outer tube 6 in a state that can be smoothly moved. It can be made to.

  The exhaust inner pipe 7 is formed into a long tubular shape longer than the flexible fixed outer pipe 6 with an insulating resin material or the like, and is used as an exhaust pipe in the filling / filling operation of the filler 13.

  The outer diameter of the exhaust inner tube 7 is smaller than the inner diameter of the fixed outer tube 6, and when the exhaust inner tube 7 is inserted into the fixed outer tube 6, the fixed outer tube 6 and the exhaust inner tube 7 are exhausted. The tube 7 forms a double tube structure.

  Further, the distal end opening 7a of the exhaust inner pipe 7 is formed in a shape inclined in the pipe axis direction, and is not closed by the inner upper end surface when abutting against the inner upper end of the anchor insertion hole 10 described later. It is like that.

  On the other hand, the detection means 8 is formed in a flexible long string shape, and is inserted into the fixed outer tube 6 so that the tip protrudes from the tip of the fixed outer tube 6. The state of the object located ahead of the tip of the tube 6 can be detected.

  For example, a fiberscope is used as the detection means 8, and the state of the upper end of the inner surface of the anchor insertion hole 10 is detected based on the image obtained from the fiberscope, and the upper ends of the anchor members 3, 3. And the actual distance between the upper end of the inner surface of the anchor insertion hole 10 can be detected.

  The detection means 8 is not limited to a fiberscope, and may be one in which a sensor is attached to the tip of a flexible string-like member.

  In order to newly fix the anchor members 3, 3... To the existing concrete structure 1, first, as shown in FIGS. 2 (a) to 2 (b), a predetermined portion below the existing concrete structure 1. That is, the anchor member 3, 3... Is newly pinched and the anchor insertion hole 10 corresponding to the length of the anchor member 3, 3. A recessed groove-like lead-out portion 11 shallower than the anchor insertion hole 10 is formed by rolling an existing concrete portion around the side opening. At that time, the existing concrete portion is wound so that the existing rebars 12, 12... Arranged in the existing concrete structure 1 are exposed in the anchor insertion hole 10.

  Next, as shown in FIGS. 2 (b) to 3 (c), the anchor members 3, 3... Are opened below the anchor insertion hole 10 in a state where the distal end portion of the fixed outer tube 6 is fixed. The lower end opening of the anchor insertion hole 10 is closed by the new member 2, the formwork member 4, and the seal material 5. At this time, since the proximal end portion of the fixed outer tube 6 is in a state of passing through the seal material 5, the sealed outer tube 6 is maintained in a sealed state inside the anchor insertion hole 10 and is brought out of the anchor insertion hole 10 through the outlet portion 11. Derived.

  After the anchor members 3, 3... Are inserted into the anchor insertion holes 10 and their positions are determined, as shown in FIG. 3 (d), a detection means 8 comprising a fiberscope is provided in the fixed outer tube 6. The detection means 8 is extended while being inserted and guided by the fixed outer tube 6 until the tip of the detection means 8 protrudes from the tip of the fixed outer tube 6 and reaches the anchor insertion hole 10.

  And based on the image obtained from the detection means 8 (fiberscope), while detecting the state of the inner surface upper end part of the anchor insertion hole 10, the upper end of the anchor members 3, 3, ... and the inner surface upper end of the anchor insertion hole 10 are detected. The actual distance between the parts is detected.

  Next, the detection means 8 is pulled out from the fixed outer tube 6, and as shown in FIG. 4 (e), the exhaust inner pipe 7 is inserted into the fixed outer tube 6 in place of the detection means 8, and the fixed outer tube is inserted. The pipe 6 is guided until the tip opening 7a of the exhaust inner pipe 7 abuts on the inner upper end of the anchor insertion hole 10, and the exhaust inner pipe 7 is held by the fixed outer pipe 6 at that position.

  At that time, the actual distance between the upper ends of the anchor members 3, 3... Obtained by the detection means 8 and the upper end portion of the inner surface of the anchor insertion hole 10 is compared with the amount of feeding of the exhaust inner pipe 7. Thus, even in a situation where it cannot be visually recognized, the distal end opening 7a of the exhaust inner pipe 7 can be reliably abutted against the upper end of the inner side surface of the anchor insertion hole 10, and deformation of the distal end 7a due to excessive extension can be prevented. .

  Then, after the position of the exhaust inner pipe 7 is determined, a filler such as mortar into the anchor insertion hole 10 through the filler injection pipe (not shown) that is inserted into the anchor insertion hole 10 through the sealing material 5. Start 13 injections.

  The filler 13 such as mortar injected into the anchor insertion hole 10 flows down through the anchor insertion hole 10 and is sequentially filled from the lower side of the anchor insertion hole 10 as shown in FIG. The air located on the filler 13 in the hole 10 is pushed out as the position of the upper surface of the filler 13 rises and is discharged to the outside air through the exhaust inner pipe 7, and the pressure rise in the anchor insertion hole 10 is suppressed.

  In this state, the filling operation of the filler 13 is continued until the filler 13 such as mortar is discharged from the proximal end opening of the exhaust inner pipe 7, and the anchor 13 is filled with the filler 13.

  At this time, the distal end opening 7a of the exhaust inner pipe 7 is always in contact with the inner upper end surface of the anchor insertion hole 10, so that the exhaust inner pipe 7 is not clogged. The air can be preferably exhausted, and the filler 13 can be filled until it reaches the upper end of the anchor insertion hole 10, and the generation of bubbles or the like in the filler 13 can be suppressed.

  Next, as shown in FIGS. 5 (g) to 5 (h), after the filler 13 is filled in the anchor insertion hole 10, the filler 13 is injected before the filler 13 is cured. The exhaust inner pipe 7 is withdrawn from the fixed outer pipe 6 while continuing, and the proximal end portion of the fixed outer pipe 6 is closed. Thereafter, curing is appropriately performed to harden the filler 13, and then a portion of the fixed outer tube 6 led out from the sealing material 5 is cut to remove the sealing material 5. Finally, the lead-out unit 11 is filled with mortar 14 and the like, and plastering is performed to complete the filling operation.

  In this way, by curing and hardening the filler 13 such as mortar, the anchor members 3, 3... Are fixed through the filler 13, and the anchor members 3, 3. To complete the joining of the new member 2 to the existing concrete structure 1.

  In the above-described embodiment, the example in which the air in the anchor insertion hole 10 is pushed out through the exhaust inner pipe 7 by the space compression by injection of the filler 13 has been described. The side may be connected to suction means such as a vacuum pump, and air in the anchor insertion hole 10 may be sucked by this suction means to apply a negative pressure to the anchor insertion hole 10. The injection work becomes easy and the work efficiency is improved.

  Furthermore, in the above-described embodiment, the example in which the anchor insertion hole 10 is formed in a shape in which a plurality of anchor members 3, 3... Are inserted simultaneously has been described. It is also possible to provide a fixed outer pipe for each anchor member.

  Furthermore, in the above-described embodiment, the example in which the anchor insertion hole is formed in the shape opened to the lower side has been described. However, the shape may be a shape oriented in the horizontal direction opened in the side surface portion of the existing concrete structure. .

  Moreover, although the existing concrete structure demonstrated the example which is a superstructure of a bridge in the above-mentioned Example, an existing concrete structure is not limited to this.

1 Existing Concrete Structure 2 New Member (Sole Plate)
DESCRIPTION OF SYMBOLS 3 Anchor member 4 Formwork member 5 Seal material 6 Fixed outer pipe 7 Exhaust inner pipe 8 Detection means 10 Anchor insertion hole 11 Deriving part 12 Reinforcing bar 13 Filler 14 Mortar

Claims (4)

After forming an anchor insertion hole in the existing concrete structure, an anchor member is inserted into the anchor insertion hole, and in this state, the anchor insertion hole is filled with a filler, and the anchor member is integrated with the existing concrete structure. In the anchor member fixing method of an existing concrete structure to be made,
The anchor member is inserted into the anchor insertion hole with the distal end portion of the fixed outer pipe fixed, and the exhaust inner pipe is movably inserted into the fixed outer pipe. Extending until the tip opening hits the inner upper end of the anchor insertion hole, and then filling the anchor insertion hole with the filler while discharging the air in the anchor insertion hole through the exhaust inner pipe. An anchor method for anchoring an existing concrete structure as a feature. The anchor member fixing method for an existing concrete structure according to claim 1 , wherein a base end side of the exhaust inner pipe is connected to suction means, and negative pressure is generated in the anchor insertion hole by the suction means.     A string-like detection means for detecting the state of an object positioned ahead of the distal end portion of the fixed outer tube is inserted into the fixed outer tube, and an inner upper end in the anchor insertion hole is used using the detection device. The anchor member fixing method for an existing concrete structure according to claim 1 or 2, wherein the exhaust inner pipe is inserted into a fixed outer pipe in place of the detecting means after the state of the portion is detected.   The anchor member fixing method for an existing concrete structure according to claim 3, wherein the detecting means is a fiberscope.

Images